Projector for page printers



July 2, l1946.

w. H. EDDY PROJECTOR FOR `ILAGE PRINTERS Filed July 17, 1940 6Sheets-Sheet 2 wILuAM H. EDDY 25J K BV@ ToRNsY July 2, 1946. w. H. EDDY2,403,269 l V PROJECTOR FOR PAGE PRINTERS l l Filed July 17', 1940 ssheets-snm :s

L|89 l lso mveNToR i WILLIAM H. EDDY ATTORNEY July 2,1946. w. H. EDDY2,493,269

PROJECTQR FO R `PAGE PRINTERS Fileduuly 17, 1940 v s sheets-sheet 4 r 8|I I8 FIG, 6 l A |28 l |23 [26 y y41a FIG.i 7

INVENTOR WILLIAM H. EDDY TToRNEY JUIYIZ, 194.6. w.rH. EDDY PROJECTOR FRvPAGE PRINTERS -*ieduuly 17, 1940 v mvENToR v w|LL1AMH. EDDY BY JM AToRNEY July 2, 1945 1 S'N. H. EDDY n PROJECTOR FOR PAGE PRINTRS 6Sheets-Sheet y6 Filed July 17. 1940 l INVENToR w|LL|AM Hf EDDY BY J ENNN ATT Ey Patented July 2, 1946 William H. Eddy, Downers Grove, 1li.,assignor tol Tclctype Corporation, Chicago, Ill., a corporation ofDelaware Application July 17, 1940, Serial No. 346,002

11 Claims.

The present invention pertains to printing telegraph projection systemsand apparatus and more particularly to 'combination page printers andprojectors for displaying on a screen or in.

spection area information in enlarged characters.

'I'he primary'object of the invention istoprovide a pageprinter-projector which is capable of operating reliably and efficientlyin any angular position.

Another object of the invention is to provide a mechanism forautomatically controlling the weight of printing upon the recordmaterial so as to produce upon the screen images of uniformdistinctness.

According to the present invention a projection system has been providedwhich embodies a page printer, of the type shown in U. S. Patent No.1,904,164, designed to give upon a screen a running account of receivedvmessage matter, through the instrumentality of an optical systemcomprising an arrangement of inclined mirrors so that the printer andlamp housing may be located at the lower part of a suitable cabinet,

and the screen formed as a part of the upper for-v ward wall of thecabinet and positioned above the printer compartment.

Specifically, the page printer is mounted on rails supported in astructural frame to Which is pivotally mounted the lamp housing, in suchmanner that the lamp housing with its condensing lenses is positionableso as to embrace within the system;

' lamp housing and part of the optical arrange--v of the invention willappear from the following detailedi description taken in conjunctionwith the accompanying drawings, in which,

Fig. 1v is a perspective view of the projection cabinet with a part ofthe Wall broken away to show schematically the optical and projectionFig. 2 is a cross-sectional 'view of the printerprojector according tothe present invention;

Fig. 3 is a cross-sectional view of the printer showing a printingimpact equalizing mechamsm;

Fig. 4 iS a detail cross-sectional view taken on line 4--4 of Fig. 2;

Fig. 5 is an enlarged side view of a type bar head;

Fig. 6 is an enlarged side view and partial section of the printermechanism and associated ment;

Fig. '7 is a perspective view of the printer impact equalizing mechanismaccording to the presof the printerprojector;

Fig. 10 is a. sectional view taken on line Iii-I0 of Fig. 9;

Fig. l1 is an enlarged cross-sectional view of the printer platen andplaten frame;

field of projection the last line of printing, and

also to include eight or ten printed lines. Printing is eiected on aCellophane strip and the image of the record produced thereonis'projected through the optical system onto the screen.

The Cellophane web or strip is drawn upwardly through the projectionileld. 'I'he characters on the section of the web in the projectionfield are so arranged as to form horizontal lines one above the other,and the images of said horizontal lines ing lenses is swingable upwardlyabout its pivotal articulation with the structural frame to permit readyaccess to the page printer, which is slidable on rails so that when thelamp housing is raised, the printer may be slid outwardly to permitWithdrawal and thus lrender't accessible for servicing.

The foregoing and other objects and features 55 net, indicated generallyby'the numeral I I, which is provided in the lower portion thereof witha door I2, and in the upper portion with a trans- Fig. 12 is a. viewtaken substantially on line I2-I2 of Fig. 11; and

Fig. 13 is a top view of the part of the printer mechanism shown inFigs. 11 and 12.

Having reference to the drawings in which like reference charactersindicate similar parts throughout the several views, the combinationpage printing and projecting apparatus according to the presentinvention is housed in a cabilucent projector screen I3. Secured to theiioor of cabinet Il are two-angle iron rails I4 (only A one of which isvshown in Fig. 1) which provide a track for the frame I5 (Fig. 2) whichsupports the page printing apparatus, indicated generally by the numeralI6, the lamp housing I'l, and the .optical arrangement representedgenerally -by -condensing 1enses`l 8, small mirror I9 and ob-v jectivelens 2|. Wheels 22 are journaled to the bottom side members ofthe frameI5 andcooperate in rolling relation with rails I4, whichare providedwith indentations 23 into lwhich the Y wheels 22 are admitted II, restsupon spacing bosses 25. In the fully inserted position, the frame I -isanchored by means of bolts 99to the base of the cabinet I I. With thisarrangement, the frame is easily insertable in Ythe cabinet IlY by meansof rollers 22, and moreover is adapted, when the proper position hasbeen assumed, to rest upon spacers and to be anchored to the cabinet bythe bolts.

At each side of frame I5 and disposed at the when the frame I5, 'inassuming its fully inserted position in the cabinet mirror I9 andtheobjective lens 2| facilitate the proper positionment ofthe image onthe screen.

Mirror 5I is supportedat three points to minimize, or even eliminate thepossibility of injury to the mirror due to a twisting action. Mirror 5Iis secured to the cabinet II through the instrumentality of a bracket 58located centrally rear thereof are pivot supports 24 for a frame 26 lwhich carries the lamp housing I1 and condenser lenses I8. A bar 29(Fig. 6) ispivoted to frame Y 26, and the lower end of said bar isprovided with a hook portion (not shown) which, when the frame 26 isswung upwardly about pivots '24 to facilitate removal of theprinter forservicing, is

held in its upward position by the engagement of said hooked portionwith spacer stud 9 (Fig. 8) in well-known manner, the bar 29 thusserving as a brace or support. The lamp housing I1 comprises an outercasing 21 (Fig. 2) which is secured to a plate 28 fastened to a crossbar29 of( the frame 26. Contained within the lamp housing I1 and suitablyspaced from the outer casing 21 thereof is a baiile plate 3l which restsupon the bottom of thehousing l1 and extends upwardly to a point closeto the top, as illustrated in Fig. 2. The ybottom of the housing I1 isprovided, between the outer casing 21 and the baille plate 3 I, withapertures 32.. This construction permits the ow of convection currentsbetween the outer casing 21 and the baille plate 3| for coolingpurposes. Housing I1 is provided with a cover 33 having a grilledsection 34Lcov'ered by a meshing if desired. Depending fromA the cover33 and spaced therefrom is a baille plate 36 (Fig. 2) of substantiallythe same area as the opening 34'. To

protect the condensing lenses I8 from the heat of the `bottom edge ofthe mirror. At each of "the upper corners of mirror 5I is provided ationed behind the mirror 5I.-

bracket 59 by means of which themirror is secured to the roof of cabinetII. Mirror 5I is in the form of a regular trapezoid, with the shorter ofthe parallel sides positioned contiguous to bracket 58. The trapezoidalshape of the mirror 5I conforms to the eiective shape of the eld ofprojection at the angle at which mirror 5I is placed in cabinet I i.Mirror 5I, so shaped, produces a rectangular visual iield or eld ofprojec- 'tion on screen I3, which accordingly is of rec-y tangularconformation.

A blower or exhaust fan 14 (Fig. 1) is located at the upper part of thecabinet II and is posi- Y Blower 14 is so mounted that its exhaust portprojects through an aperture 16 in cabinet II, and is suitably supportedin said cabinet.

Having reference to Fig. 2, a page printer of the type shown. in U. S.Patent No. 1,904,164 is mounted in the frame I5. The printer, indicatedgenerally as IS, has been modified in certain respects to adapt it foruse with the projectorfof the present invention. The page printer`comprises of lamp 31, the bottom ofl the housing I1 may be cut awayimmediately adjacent thereto, to afford greater ventilation thereabout.Lamp 31 is fadjustably clamped to a bracket 3'9, which in turn'isadjustably supported by the floor vof the housing l1. A reector 4I isspringclamped by a carrier 42 which is adjustably supported, through theinstrumentality of a rod 43 and the enlarged mounting holes for plates45, by the outer casing 21 of the lamp housing I1.

'In the embodiment of the invention shown in the drawings, a condensinglens system I8, comprising two plano-convex lenses and oneconvexe-convexlens, is provided, these lenses being suitably clampedbyYclamps 94 to plates 28, 46,

and 41 which are appropriately separated byv through the printing zone.I 49 in being withdrawn from the roll 83 is dithe side frames 18 and 19(Fig. 6) to which is `pivoted at 8| a platen frame indicated generallyas 82. The usual cylindrical form of platen has been dispensed with4 inthe present embodiment of the invention and has been substituted by thedisc form of platen I13 shown in Figs. 11, 12, and 13, and which will behereinafter described.

To providefarunning account of the message printed on the page material,a delivery mechanismvis provided which comprises a means for permittingthe record material to escape from the supply roll, suitableguides, anda web pulling means whereby the page material is advanced The pagematerial rected over a slack bar 84 which is pivoted at 85 and isnormally biased clockwise by a spring As previously mentioned, theoptical system of the present invention includes a mirror I 9 and anobjective lens 2l.l The optical system also in-y cludes a mirror 5I(Fig. 1) supported in the upper part of the cabinet Il, and through thissystem the image is projected upoithe screen I3. The mirror I9 isadjustably pivoted on a pair of standards 52 by means of which itsangular position may be determined. `Moreover, standards 52 are Aadjustably mounted on brackets 53 secured to 75 the pressure roller 94from engagement with 86 to maintain the page material or cellophane webtaut between the roll 83 and a anged cylindrical guide 81 carried on a,shaft 88 journaled in plates 89 depending from side frames 18 and 19.;'I'he web 49 is ,then directed over-a roller 9| to which is xed aratchet wheel 92, the ratchet wheel and roher being carried on a shaft93 l journaled in the plates 89secured to side trames 18 and 19.Cooperating with the roller, 9| is a pressure roller 94 which is carriedona standard 96 secured to a rock shaft 91. Pressure roller 94 is drawninto pressing relation with roller 9I by means of a spring 98. Securedto rock shaft 91 and located in juxtaposition to plate 89 is a pressureroller release lever 99. Cooperating with lever 99 is a shoulder IDI onplate 89 arranged so that whenlever 99 is actuated counterclock- Wise(as viewed in Fig. 6) against the action of spring98 it will latch upbehind or on the lefthand side of the shoulder IBI, thereby releasing Yconnected in a signal line (not shown) on which s Patent No. 1,904,164.

shoulder to permit spring 98l to bring rollerv 94 again into pressingrelation with roller 9|. Associated with the ratchet wheel 92 is a pawlmember |02 (Fig. 2) which is pivoted toa bell crank lever |03 carried ona pivot shaft |04; The

depending arm of bell crank |03 is pivoted to onev end of a push rod|06, the other end of which is shouldered to cooperate with a functionbail |08 in the manner shown in the aforementioned Thus, in response toa predetermined selection a function lever similar to function lever |01shown in Fig. 6 is selected to raise the free end of push bar |06upwardly into the path of the,function bail blade |08. Then','when thepush rod |06 is actuated 'leftwardly by the function bail |08, clockwiserotation is'imparted to bell crank lever |03 to. irnpart'in turn,downward movement to pawl |02.

In this manner, the ratchet wheel 92 is rotated' clockwise one step,which, through the cooperation of lpressure rollers 9 I and 94, acts in'cooperation 'v'vith a web vpulling device to deliver 'a predeterminedlamount of record'material 49 vfrom the supply roll 83 to the printingzone andthe projection area.

may take the form of a fixed rod carrying guiderollers thereon toeliminate friction. From the guide rod ||2 the record material 49 isdirected vertically through the printing zone and projection area to aguide rod i3 carried by a U-shaped shifting frame member ||4 (Figs. 2,6, and 8) pivotally `carried on pivots ||5 and |6 (Fig. 8)

vsuitably journaled in the frame l5. The page material 49 is thendirected around a guide rod ||1 carried in supports ||8 (Fig. 6)depending from bars ||9 secured to'angle iron cross bars |2| and |22 offrame I5. From thence, the page material 49 is directed around a spindle|23 fixed to a shaft |24 journaled in standards |26 supported on saidbars H9.

Shaft |24 is interconnected through a friction clutch |21 to a pulley|28. Continuous counterclockwise rotation (as viewed in Fig. 6) isimparted to pulley |28 through the instrumentality of a beltI294c'onnected to a pulley |3| fixedV to the main operating shaft |32 ofthe page printing apparatus shown in Patent No. 1,904,164. Shaft.I32carries a gear |33 which meshes with'a pinion gear |34 fixed to shaft|35 of a motor |36 (Fig. 2). Motor |36, therefore, through gears |34 and|33, shaft |32, pulley |3|, and belt |29 imparts continuous rotation topulley |28 which, through the friction clutch |21, imparts a co'n- Y tomside thereof on a stud |55.

ates between a pair of blades |56 and |51 of a stant torque throughshaft |24 to the spindle |23. `With this arrangement the page material49 in maintained in a taut condition between the spindle |23 and theroller 9|. Thus, when the ratchet 92 yis rotated one step apredetermined amount of the page material 49 is delivered from thesupply roller 83, which material is immediately taken up by the spindle|23 to preserve the` taut condition of the page material.

As disclosed in the aforementioned Patent No. 1,904,164, the pageprinterr |6 is controlled telegraphically by a selector magnet |31. Thisis are impressed code combinations of signalling impulses. The codeAsignals control, through a v(i and 9).

|38 which, in turn, controls through bell cranks |39 (Fig. 9), a set ofcurvedcode bars |4| (Figs.l Code bars |4| and .bell cranks |39 aresupported on a movable type carriage. indicated generally by the numeral|42, which is provided with rollers |43 and |44 whereby it is adapted totravel on tracks |45 and |46, respectively, positioned between sideframes 184 and 19. Cooperating with co'de bars |4| are a plurality ofpull bars |41 having individual springs |48.` Pull bars |41 areoperatively connected by rack and pinion connections to a correspondingplurality of type bars |49 pivoted on a shaft |5|.

Type carriage |42 is also provided with a' spacing rack l|52 whichcooperates with a spacing mechanismmot shown) similar to thatillustrated in Patent No. 1,904,164, to control the movement of typecarriage |42 to form character spaces, tending in this'movement to windup a carriage return spring mechanism indicated generally in Fig. 8 as|50, the strap |60 ofwhich is secured to stud |10 fastened to typecarriage |42. Upon receipt of the `carriage return signal, a functionlever (similar t'o lever |01) is selected and the carriage returnmechanism actuated inl the manner described in the aforementioned.Patent No. 1,904,164. Carriage return mechanism |50 is thereuponpermitted,l due to the energy stored therein, to return the typecarriage |42 to its normal or beginning-of-line position. A pull barbail |53 is mounted in the type carriage |42A and i's provided with aroller |54 carried on the bot- Roller |54 oper-- mainA printing bail |58so that bail |53 can be reciprocated by bail |58 in any characterspacing position of the type carriage` |42. Fastened to the printingbail |58 is one end of a printing spring |59, the other end of which isconnected to ya printing blow adjustment means as shown in Patent No.1,904,164. Bail |58 is mounted on a shaft |6| on which is also carried aprinting bail actuator |62 which cooperates with a printing cam |63.Actuator |62 carries at the end of its upper arm astud |64 which hasabutting relation only with printing bail |58 and is notl permanentlyconnected thereto, which is to permit spring printing. Printing bail |58is also provided with a pair of arms |66 which carry a function leverbail |69. Also carried on shaft 6| is a function bail comprising arms|65, |66, and |61. Arm |65 is provided with'a follower roller whichcooperates with a function bail cam |68, and arm |61 supports on its endthe function bail blade |08.

Associated with the selector vanes |38 are a plurality of functionlevers |01 mounted on pivot rod |1I and provided with individual springs|12 which tend to rotate the function levers clockwise into registrywithv the selector vanes |38. The function 1evers |01 are normally heldout of engagement with the selector vanes |38 `by means of the rod |69of the function lever bail. As previously mentioned, the platen frame 82is pivotally supported on pivots 8| in side frames 7. with the printingpoint or zone determined by the path of operation of the typebar |89.

The platen frame 82 is .adapted to be rocked from the letters or unshiftposition to the iigures or shift position in the manner fully set forthin theA aforementioned Patent No. 1,904,164. Briefly, the side frame ofthe platen frame. 82 (as shown in Fig. 6) is providedwith a lug |11which operates between two adjustable stops |18 and |19. Adjacent to lug|11 there is pivoted to the side frame of the platen frame 820m pivot I8 I, the upper end of a link 82, the lower end of which is pivoted tothe horizontal arm of a bell crank lever |83 pivotally mounted at |84.To the lower end of the depending arm of bell crank V|83 is pivoted apush bar'i 85, the free end of which overlies a rearwardlydirected armof the function lever |01. Push bar |85 is also'provided with a shoulder|88 which cooperates with the function lever bail blade |08.v The platenframe 88 and platen |13 are shown in the letters or unshift position,with the stop lug |11 against the upper stop screw |18. This conditionis achieved when the function bail blade |08 has operated upon.theshoulder |86 to move the push bar |85 leftwardly to rotate the bellcrank |83 clockwise, thus raising the link |82 to cause the platen frame82 to rock clockwise.

A correspondingly similar construction is provided for the figures orshift mechanism. I'hat is. a shift function lever |80, similar to lever|01, is provided which when selected is caused to rotate clockwise tobring its rearwardly extending arm into operation to raise a push bar,similar to .bar |85, into the' path of the function bail blade |98which, when it is permitted to operate lei'twardly (as viewed in Fig.6), will cause a bell crank, similar tol bell crank |83, to pull down alink similar to |82 to rock the platen frame 82 counterclockwise tobring itsy stop |11 against the lower stop screw |19. T he platen frame-82 is maintained in its shift or unshift position by a face of theplaten |18 is` parallel to the record strip when the platen frame 82 hasbeen shifted to the upper case position, as indicated in Fig. 11, by thedotted line |94 of the platen |13,

To compensate 'for this arrangementy of thel platen |13, the type faceson the type bar |49 are arranged as shown in Fig. 5. Moreover, thisarrangement of type faces in cooperation with a shield |95 (Fig. 1l)serves (as will presently appear) to prevent smudging during theprintingV operation. As is well known, the type bar-|49 is provided withan upper case type face |96 and a lower case type face |91. to thepresent invention the lower case type face |91 is provided with a slopecorresponding to the However, according slope of the periphery oftheplaten |13 when;

in the lower case position. The dimension 201 of the upper case type |96is arranged to be slightly less than the minimumheight 2|0 of the lowercase type |91. When printing is eiected in the lower case position, thetype face |96 being lower than the type face |91, will not touch therecord material and hence noA smudging of the sition, means is providedfor preventing the lower spring actuated detent member |81 acting on a'-detent roller |88.

In Figs. l1, 12, and'13 is illustrated the manner in which the platencarriage |14 is connected to the type carriage |42 so `as to be movabletherewith. As previously mentioned, the platen carriage |14 is slidably`supported on rods I 15 and -|18. Carriage |14 is provided with aneccentric stud engaged by the forked end of a bar |89, the left'end ofwhich (as viewed in Fig. .12) -is secured to a member |9| which issecured by screws |92 to the type carriage |42. As viewed in Fig. 13,the circular platen |13 is rotatably mounted on the platen carriage |14by means of an eccentric means |93. By means of the adjustment |93 theplaten |13 is adjustable toward and away from. the record material tovary the clearance therebetween. Rightward and leftward adjust` ment, asviewed in Figs. 12 and 13, is also provided for the platen |13, throughthe instrumentality of the eccentric adjusting means |90.

An important feature of the present invention is the provision of aplaten so positioned as to reduce to a minimum the obstruction of thepro-` jected image by the platen. To achieve thisv result the platen-|13 is tilted with respect to the record material printed upon,sufficiently to clear the light cone. The peripheral surface of theplaten |13, upon which printing is eected,

sitions ofthe platen the peripheral surface of the platen will beparallel to the record material. In the present embodimentthe peripheralsurtioned Patent N o.

printed record will occur.

When printing is effected in the upper case poent No. 1,904,164,oscillates the inking ribbon into and out of the path of the type facesduring theprinting operation. The ribbon oscillator |99 pivotallyarticulated to arm 20| of a lever 202 which, in turn, is pivoted at 203to a lever 205 pivoted at 220 to the type carriageldZ. Lever 204 isarranged to carry a roller 205 which rides on the bottom side of a rail208 mounted on the platen frame 82, as disclosed in the aforemen1,904,164. Roller 205 is pressed against the rail 206 byl a spring (notshown), so that when the platen frame 82 is rocked between the shift andunshift positions, roller 205 will constantly contact with said rail205, and lever 202 will be reciprocated therewith.

The depending arm A20|? of the lever 202 is operably associated with thepull bar bail |53 (Fig.

2) so that the reciprocative motion of bail |53` will cause theoscillation of the lever 202 about pivot 203', whether the platen frame82 is in the shift or the unshift. position. Thus, when the bail |53 isin its normal position (the leftwardL will be raised to printingposition due to the counterclockwiseV movement imparted tothe lever 202by the bail |53. When the platen frame 82 is in the position shown inFig..9, which is the lowercase printing position, the shield |95,

. is slightly beveled so that `in one of the shift pouponoscillation oflever 202, will not be raised suiciently to be interposed between thetype face |91'and the platen |13. However, when the platen frame 82 isin the upper case printing position with the platen |13 in printingrelation with the upper case type face |96, the shield |95 will, uponreciprocation, be raised so as to become i I coiled spring 200,v a taut9 l interposed between the lower case type face |91 and the recordmaterial, thus preventingany which has accumulated on the type face |91from smudging the record material.

. As iuustrated in Figs, 11, 12, and 13, there is provided a platenrotator for automatically changing the printing point of the platen |13in response to each carriage return operation. As previously.described,`the platen |13 spaces with the type carriage |42, and accordingly isspaced step-by-step for character spacing and, upon 10 spring returnmechanism 233 is mounted on a bracket v234 secured to the frame |5.

As the carriage |42 advances step by step in response to the spacingmechanism, the carriage vreturnspring mechanism |50 is wound up andenergy is stored therein in readiness to return the carriage.l At thesame time, the carriage return mechanism 233 is also wound up to'storeenergy ltherein', sothat when the carriage return signal reaching theend of the line, the platen |13 .is

returnedrapidly with the carriage |42 to the beginning-of-line position.In contact with the platen |13 at a point opposite to the printing vstored up inthe return mechanisms |50 and 233.`

point is a closely wound coiled spring 200 which .bers o! the platensupporting frame 32, in such a manner that the platen |13 is4 caused torotate as it advances duringJ character spacing. lil/[ore-v over. uponthe rapid return movement of the platen |13 (under the influence of thecarriage return spring |50) during the performance oi the is connectedat its ends to theside frame mem,-

is received bythe printer the carriage is freed in the .mannerydescribed in the aforementionedPatent N o. 1,904,164', and the carriagereturn opera, tion is effected through the release of the energy In; theembodiment shown in Fig. 8, the return of the carriage |42 and thecounterweig'ht 2I1. is illustrated aseffected by two return mechanisms,

the return mechanism |50 acting' directly upon the type carriage |42yand the return mechacarriage return function, the platen |13 will, ow-

ing to the combined sliding and rolling relation with the yieldablespring member 200, rotate incommensurately, thus causing the sameprinting cated either at the position shown by the return point of theplaten to ,be presented to the type bars va minimum number of times.-In-other words, through lthe instrumentality of the platen rotator 200,the platen |13 is controlled ln'such manner as toreduce to a minimum thenumber of times any particular printingpoint on the platen is impingedupon, thereby reducing to a minimum the wear at, any given point andhence prolonging the life of t'he platen. In lieu of the Wire or cord,of course,

can be used.

In accordance with the present invention, the

I printing apparatus used in combination Awith the projection lsystem isof such structureI and arrangement that it is not affected by change inphysical position of the assembly as a whole with respect to gravity.Specifically, a, eounterweight is provided which is -associated withthemovable type carriage |42 so as to render the movement of the typecarriage |42 independent of nism 233 acting directly upon thecounterwelght 2|1.'l The tworeturn mechanisms cooperate to facilitatethe return of both devices. If desired, a single return mechanism may beemployed by providing a return spring mechanism of suiilcient strengthto return bothdevices. .In this event, the spring return mechanism maybe lomechanism |50 or by the return mechanism 233..'

Therarriage return' mechanism |50 is provided with adashpt buffermechanism as is shown and aforementioned Patent No.

described yin. the 1,904,164.

` Thekcounterweight return mechanismf is simi- 'i larly provided with abuffer mechanism. 'I'hisI buii'er mechanism for the counterweight 2 I 1comprises a dashpot 235 suitably mounted in the plate 236 secured t0frame I5. Pivotally .sup-

' ported at 231 on bracket 240 and properly positioned with respect tobuffer 235 is a buffer lever 23B.. The rounded end of lever 238 fitsinto a notched portion ci the plunger 239 of the bluifer 235. End 24| ofthe plunger 239 is adapted to receive the blow from the counterweight 2I1, said the force of gravity and to assist theA carriage return springin uniformly moving the type carriage in any physical position of theprinter.

vis movably supported on tracks |45 and |48, and

.after being operated upon'by the spacing mecha-` in the frame I5.Secured to end 2|9 of bar 2I2 is a stra-p 22| which extends around anlidler roller 222 and is fastened at 223 to the counterf weight 2|1. nnerroller mis rotatably mourned on the bar 2I8. Counterwelght 2|1 isprovided with rollers 224 and 225 which roll on upper rail 228. androllers 221 and 228 which roll on lower 'rail 229. Rails 226 and 229 areappropriately supported-in the frame I5. Secured at 23| to thecounterweight 2|1 is a. strap 232 of a springreturn mechanism 233comparable to the carriage return spring mechanism |59. The

As previously described, the type carriagev` |42 l end 24| beingreceivable in the counterbore 242 -in the counterweight 231. Thecounterbore 242 is indicated in the present embodiment for structuralpurposes only and is not an essential element of the structure.V Theresistance of pneumatic buffer 235 is varied by means of adjustableports, in a well-known manner. A spring 243 tends to rotate lever 238 ina counterclockwise ,-directioniFig. 8) about pivot 231 to restore the-buil'er mechanism to its operative position.

Normally, in making a printed recordthe impact of the type faces againstthe :platen in the lower caseposition is slightly greater than it is inthe upper case position of type faces |96, due to the fact that thelower case type faces |91 are closer to the tylpe bar pivot |5| than arethe upper case typefaces |96.I In an'ordinary printed record the slightdifference in density of printing in each case is not discernible..However, due to the characteristics oi the transparent web upon whichprinting is effected for projection, this difference of density oi'printing is more noticei able. To compensate for this variation indensity of printing, the .present invention provides means forequalizing the prlntingimpact of the lower and upper case type facesautomatically, so that printing of equal density is produced wpon therecord material. The variation in density of printing is morenoticeablewhen printing is effected upon transparent record material,such as is used in printer-projector apparatus oi' the type according tothe present invention.`

f il y Having reference to Figs. 3 and '7, a lever 245 is pivoted at 246to a plate 241 which is adjustably mounted by means ,of slot-and-screwadjusting means to bracket 248 carried by printer frame 19. A spring 249extends between the upper end of lever 245 and a spring post 25| carriedon printing bail |58. The Ilower end of lever 245 is provided with alaterally extending portion 252 which 'cooperates with a dependingprojection 253 on the upper case -shift push bar 254.l Lower case andupper case push bars |85 and 254, respectively, are articulated to aplaten shift control lever 255 pivoted at 256 in the printer in suchmanner that lever 255 isrotated in a counterclockwise direction (asviewed in Fig. 7) when push bar 254 is operated leftwardly by thefunction bailblade |88, and in a clockwise direction when .push bar |85is operated leftwardly. Push bar 254 is maintained in operative relationwith control lever 255 by a spring 251 extending from projection 253 onbar 254 to a projection 258 on lever 255. Simif larly, push rod |85 ismaintained in operative relation with control lever 255 by a spring 259extending from projection 26| on bar |85 to projection 262 on lever 255.

To print a character, the code signal corresponding thereto is receivedby the selector magneti |31 (Fig. 6) which, in turn, controls, throughselector vanes |38 and bell crank levers |39, the

`setting of code bars |4|. 'I'he selector cam drum associated withselector magnet |31 controls (as f described in Patent No. 1,904,164)the initiation of rotation of operating shaft |32 which carries theprinting cam |63 and the function cam |68.

' In proper timed relation with the setting of code bars |4I, theprinting bail |58 is operated under control of cam |83 to cause thereciprocation,

tion 252 of lever 255, thereby imparting counterclockwise movement tolever 255 to stretch the spring 269, thus increasing the tensiontherein. Now, when the printing bail |58 is operatedin response tosubsequent character code signals, the pull of the printing spring |59will be resisted by the pull of spring 249, thereby reducing the forceof the printing blow, so that `the impact'of printing is equal in bothupper and lower case.

When the upper case or .figures shiftl signal is received, the guresshift function lever |88 is selected and operated to bring shoulder 263of push bar 258 into the path of function lever bail blade |88, which,when operated, urges push bar B leftwardly to impart counterclockwiserotation to lever 255, which movement will cause,

. through -bell crank lever |83 and link 82, the

through the instrumentality of roller |55, of pull bar b'ail |53, which,through the rack and pinion articulation between pull bars |41 and typebars |49 will cause the impingement of the selected' type bar againstthe platen |13 to eiiect printing.

The power for effecting the printing operation is supplied by theprinting spring |59 and, as previously mentioned, a means is provided for automatically varying the power supplied by said spring in-accordance with the case shift condition of the printer. It has beenfound upon magnification of the printed record incident to projectionupon a screen, that the diierence in the 'distances of the upper andlower typefaces from the type bar pivot causes a difference in theweight of printing which indicates a difference in the printing impactof said type faces. To

equalize the printing impact so that it is substantially the' same inbothupper and lower case, the spring 249 is provided, which in the lowercase position is caused to resist the movement-of the printing spring|59, thereby reducing the impact of the lower case type face against theplaten suiiiciently to equal the corresponding impact a of the uppercase type face.

Upon receipt of the lower case or letters shift signal, the "letters"`'shift function lever |81 is selected andv operated in the mannerdescribed in Patent No. 1,904,164 to raise push bar |85 to bringshoulder |86 thereon into the path of function lever bail blade |08which, when operated, urges push bar'l85 leftwardly (as viewed in Fig.7) to` impart clockwise rotation .to control lever 255. Lever 255,besides effecting the shift of the platen frame 82 to the letters caseposition (as indi-` y cated in Figs. l3 and 6), causes the push bar 254to be moved rlghtwardly, and in so doing, the projection 253 thereonengages .the lateral'pl- '75 return mechanisms to render saidmechanismst position with projection |11 bearing against stop |19.Moreover, push bar |85 will be shifted rightwardly, and projection 253of bar 254 will be moved away from and out of operative engagement withlateral portion 252 of lever 245. Spring 249 will thereupon be renderedineiective, since lever 245 and spring 289 are now free to move withprinting bail |58, and no resistance is offered by spring 259 to theprinting spring |59. A spring 264 of very light tension extending fromlever 245 to spring post 265 on bracket 248 is provided to take up theplay of the mechanism.

. Although specic embodiments of the invention have been shown herein',it will be understood that the invention is capable yof modiiication,and it is intended that all forms which come within the rangeofequivalency are' to be embraced Within the scope of the appendedclaims.

What is claimedis: l. In a printing device, a` carriage movable to `formcharacter spaces, means for advancing said carriage, means for returningsaid carriage, and

- gravity responsive means cooperatively associated with said secondrecited means to render said second recited means effective irrespectiveof change in physical position of the printing device with respect togravity.

'automatic means for moving said carriage in oney direction, means formoving said carriage in the opposite direction, and gravity responsivemeans l cooperatively associated with said second recited means torender said second recited means effective irrespective of change inphysical position of the printing device with respect to gravity.

4. In a recorder, a stationary supporting framework, a typecarriagemovable with respect 'to said stationary framework, a printinghail in said stationary framework, slidable connecting means betweensaid carriage and said bail to effect recording operations, spacingmechanism eiective automatically for advancing said carriage anincremental amount during each recording operation, a carriage returnvmechanism for restoring said carriage automatically tobeginning-of-line position, and gravity responsive mean's cooperatively.associated with said spacing and carriage effective irrespective ofchange in physical posi-` tion of the recorder with respect to gravity.

5. In a printing device, a carriage, track means for facilitating themovement of .said carriage to form character spaces, means effectiveautomat-il cally ,for moving said carriage in one direction,

energy storingand releasing means for moving said carriage in theopposite direction, a gravity responsive means, a second track means forfacilitating the operation of said gravity responsive means with.respect to said carriage, and interconnecting instrumentalities betweensaid carriage and said gravity responsive means, whereby said saidcarriage and said gravity responsive means,

whereby said gravity responsive means is effective to render both ofsaid carriage moving means effective irrespective of change in physicalposition of the printing device with respect to gravity. f

7. In a printing device, a type carriage, track y means foi`facilitating the movement o f said carriage to form character spaces,means eiective automatically for moving said carriage in one direction,power storage means for moving said carriage in the opposite direction,a. gravity responsive means, a second track means for facilitating theoperation of said gravity responsive means with respect to saidcarriage, and interconnecting instrumentalities between said carriageand said gravity responsive means, whereby said gravity responsive meansis eiective to render both of said carriage moving means effectiveirrespective of Vchange in physical position of the printing device withrespect to gravity.

8. In a recorder, a stationary part comprising a supporting framework,atype carriage movable 50 with respect to said frameworha printing bailin 14 said stationary part, slidable connecting means between saidcarriage and said bail to effect recording operations, spacing mechanismeffective automatically for advancing said carriage an incrementalamount during each recording operation, a carriage return mechanism forautomatically restoring said carriage to beginning-of-line position,gravity responsive means, means for facilitating the operation oi saidgravity responsive lomeans with respect to said carriage. andinterconnecting instrunientalities between said carriage and saidgravity responsive means, whereby .said gravity responsive means iseffective to render said spacing and carriage return mechanism effectiveirrespectiveof change in physical position of the recorder with respectto gravity.

`9. In a recorder, a stationary part comprising a supporting framework,a type carriage movable with respect to said framework, a printing bailin said stationary part, slidable connecting means' between saidcarriage and said bail to effect recording operations, spacingmechanismeffective automatically for advancing said carriage anincrementali amount during each recording operation, power storage meansfor returning said carriage, and gravity responsive means cooper-Iatively associated with` said power storage means.

to render said power storage means effective irrespective of change inphysical position of the recorder with respect to gravity.

10. In aprinting device, a movable carriage,-

automatic means for moving said carriage in one direction, energystoring and releasing means for moving said carriage in the oppositedirection, and gravity responsive means cooperatively associated withsaid energy storing and releasing means to render said energy storingand releasing means effective irrespectiveof change in physical positionof., the printing device with respect to gravity.

' 11. In a printing device, a movable carriage, spacing mechanism'eiiective automatically for moving said carriage in onedirection,`carriage return mechanism for automatically moving said 45.carriage in the opposite direction, and gravity -responsive means torender both said mechanisms invariably effectiveA in a predeterminedmanner on said carriage irrespective of change 1n physical position'ofsaid device with respect to gravity.

WILLIAM n. mDY.

